Haier HSU09VHJ Service Manual page 53

7. .1Thermistor or Related Abnormality (indoor unit)
the temperatures detected by the thermistors are used to determine thermistor errors
when the thermistor input is more than 4.92V or less than 0.08V during compressor
operation.
Check the connector
Thermistor resistance check
Remove the connector of the thermistor on the PCB, and measure the resistance of thermistor using
tester.The relationship between normal temperature and resistance is shown in the value of indoor
thermistor.
HSU09VHJ DB -SM
: Room temperature sensor failure
: Heat-exchange sensor failure
The values vary slightly in some models
Faulty connector connection
Faulty thermistor
Faulty PCB
Be sure to turn off power switch before connect or disconnect connector,
else parts damage may be occurred.
i
Is it normal?
Yes
Is it normal?
NO
Correct the connection
NO
Replace the thermistor
Yes
Replace the indoor unit PCB
51
Service Diagnosis
Domestic Air Conditioner
or